Mine penciled out to 46 IBUs. That's probably fairly accurate - it's got a pretty good bite to it but it's not harsh and has good flavors and aromas to smooth it out. It's a little tough to be accurate with a split batch. The other half, which only got the Magnum for bittering and and an ounce of Willamette at 5 minutes, calculates at 33 IBUs. That one doesn't really seem that bitter but it's probably about right. I'll have to judge when it carbs fully and drops good and clear.
I recently acquired a new mash tun specifically for doing 5 gallon batches and I'll be interested in developing this recipe on its own. I think that playing with the hop schedule in the boil to bring the IBUs down just a little and keeping the bio-trans hop routine will give it a really nice flavor profile.